Ok, so this isn't exactly a permissions post but it's similar.
Figaro, Maraich's son, is actually an archangel. Which means he has weird, vague and plot-convenient powers, including things like erasing memories, turning back time and changing his age.
We have a lot of demons or other types of characters who might be considered either the opposite of an angel or would be able to sense stuff.
So if you want your character to be able to tell Figaro is an angel, just say something here.
Saying he isn't human/normal is fairly normal for the series, as from the time he's born Patalliro is shouting "He's not human!"
Also feel free to ask for any sort of competition, but Figaro is obviously a lot stronger and would be more clever than Maraich.
EDIT: I'm basically always ok with the little stuff. Anyone can 'sense' something is off anytime they want.